public class parkingLot {
	private Map<int,Space> unreservedMap;
	private Map<int,Space> reservedMap;

	public boolean reserveSpace(Space)
	{
		//It will find if there is space in the 
		//unreserved map 
		//If yes, then we will pick that element and 
		//put into the reserved map with the current time value.
	}

	public int unreserveSpace(Space)
	{
		// It will find the entry in reserve map 
		// if yes then we will pick that 
		// Element and put into the unreserved map. 
		// And return the charge units with the current time value.
	}
}
